[BlackBerry] Use OwnPtr for CredentialBackingStore members
https://bugs.webkit.org/show_bug.cgi?id=111737

Patch by Carlos Garcia Campos <cgarcia@igalia.com> on 2013-03-08
Reviewed by Rob Buis.

It simplifies the code a bit.

* platform/network/blackberry/CredentialBackingStore.cpp:
(WebCore::CredentialBackingStore::~CredentialBackingStore):
(WebCore::CredentialBackingStore::open):
(WebCore::CredentialBackingStore::certMgrWrapper):
* platform/network/blackberry/CredentialBackingStore.h:
(CredentialBackingStore):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145190 268f45cc-cd09-0410-ab3c-d52691b4dbfc